Which of these is a recommended action when working with ladders on construction sites?

Ensuring ladders are placed on stable, level ground is crucial for safety when working on construction sites. This practice helps to prevent accidents and falls, which can occur if a ladder tips over or shifts while in use. A stable, level base provides the necessary support to maintain the ladder's position and ensure that it remains secure as workers climb and descend.

Proper placement not only enhances the stability of the ladder but also allows for better balance and control when performing tasks at height. By adhering to this guideline, workers can significantly reduce the risk of injuries associated with ladder use, making it an essential practice in maintaining safety on construction sites.